Functionality of Stock Intentory System : Factory Homes

Concerning following line in Factory Homes Requirement:
".... that control all inventory and valid combination of inventory in the Factory Homes catalog"

- though was prone to accept that stock inventory system validates a valid Product, BUT I decided later

a) Does not make sense to have a inventory system validate my transactional data (house design). It gets tightly coupled to the application also.
Hence I am interpreting as the stock inventory is set up to have valid combination as a group ,only for the purpose of managing stocks as a group etc.., BUT the inventory system does not have the logic determine applicability . It is done in Online Housing Design application.